Gibberellin-like activity of some tetracyclic diterpenoids from Elaeoselinum species and their derivatives

Plant growth regulation activity of steviol and derivatives

“…Another report described the activities of steviol, (À)-kaur-16-ene and (À)-kauran-19-ol in other systems (Brian et al, 1967). Some kaurane, beyerane and atisane diterpenoids, isolated from Elaeoselinum sp., were tested on six bioassays and some compounds were more active than GA 3 (Villalobos et al, 1994). These reports, therefore, indicated the potential of tetracyclic diterpenes other than gibberellins as plant growth regulators.…”

Ring Contraction of Gummiferolic Acid, a Diterpene Isolated from Margotia Gummifera, Leading to Atisagibberellins

“…The presence of the tetracyclic diterpenoids in the above mentioned umbellifers, led us to think that perhaps the metabolites we have isolated could also show phytohormonal activity either directly or as precursors of gibberellins. As a result, several samples were subjected to standard, established bioassays to test their activity [4]. We found than some diterpenoids had phytohormonal activity even better than that of gibberellic acid (GA 3 ) and we concluded that the presence of hydroxyl groups in ring B of the natural diterpenes enhances the activity, perhaps as a precursor of substances with the cylopentanecarboxylic moiety, as present in the gibberellins.…”

“…Rf : 0.47 (n-hexane-EtOAc, 8:2). IR (film): 3452, 3064, 1723, 1697, 1654 cm -1 .1 H NMR (200 MHz, CDCl 3 ): 1.03 (3H, s, Me-20), 1.42 (3H, s, Me-18), 3.72 (3H, s, COOCH 3 ), 3.93 (1H, br s, 6β-OH), 4.68 (1H, s, H-17a), 4.79 (1H, s, H-17b), 4.98 (1H, d, J = 12 4. Hz, H-6).13 C NMR (50 MHz, CDCl 3 ): 13.5 (CH 3 -20), 18.7 (CH 2 -2), 26.1 (CH 2 -14), 27.8 (CH 2 -11), 28.7 (CH 2 -13), 31.5 (CH 3 -18), 36.0 (CH-12), 39.1(C-10), 39.8 (CH 2 -3), 40.0 (CH 2 -1), 40.3 (CH 2 -15), 45.5 (C-4), 46.7 (C-8), 51.9 (COOCH 3 ), 52.1 (CH-9), 59.6 (CH-5),74.3 (CH-6), 106.9 (CH 2 -17), 149.3 (C-16), 177.7 (C-19), 215.2 (C-7).…”

Extract From Stevia Leaves Is Natural Plant Growth Stimulator

“…Энткауреновый скелет СГ сходен по строению с молекулой гиббереллина и так же, как и гиббереллин формируется по метилэритритолфосфатному пути биосинтеза изопреноидов [Totte et al, 2000;Brandl, Telmer, 2007]. Вероятнее всего, этим объясняется наличие гиббереллиноподобной активности у растворов СГ, выявленной в ряде исследований [Komai et al, 1983[Komai et al, , 1985Villalobos et al, 1994;Olivera et al, 2008;Тимофеева и др., 2010, 2015. В работах этих и других исследователей показано положительное влияние СГ на прорастание семян, рост и урожай ряда культур, устойчивость к воздействию низких температур и тяжелых металлов, а также к условиям засухи.…”